Optical comb filter

Details Optical comb filter Optical comb filter

G - Physics

02

B

88/121, 350/43,

G02B 5/22 (2006.01) G02B 27/28 (2006.01) G02B 27/46 (2006.01) H04N 9/07 (2006.01)

Patent

CA 1103500

OPTICAL COMB FILTER ABSTRACT OF THE DISCLOSURE An optical comb filter comprises a plurality of optical comb filter elements disposed successively in a light advance direction and respectively having optical comb filter character- istics for attenuating and removing respective specific space frequencies which do not have mutual relationships of odd-number multiples and frequencies that are respectively odd-number multiples of said specific space frequencies, and at least one phase plate interposed between neighboring optical comb filter elements respectively in front and rear positions with respect to said light advance direction. The phase plate functions to convert a light ray exiting from said front filter element into a light ray which is divided in said rear filter element into a normal light ray and an abnormal light ray exiting with mutually equal light intensity and to cause said normal and abnormal light rays to enter as incident light said rear filter element.

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